Bumping hammer



Feb.'7, 1939. f v E. 41. SEID E 'N ET AL 2,146,353

7 BUMPING HAMMER I iled Sept. 10, 1956 '2 Sheets-Sheet l ELMEF? JEE/DENA 2 FRANKE. MAzL/R K Feb. 7', 1939. Y E. J. SEIDEN ET AL I 2,146,353

BUMPING HAMMER Filed Sept. 10, 19.36 2 Sheets-Sheet 2 gwucm tom E1. MERJ EE/UEN 12. 2

FHA \IKE. MAZUFEK Patented Feb. 7, 1939 UNITED STATES 2,146,358 BUMPINGHAMMER Elmer J. Seiden, Jackson, and Frank E. Mazurek, Pontiac, Mich.said Mazurek assignor to said Seiden Application September 10, 1936,Serial No. 100,103

7 Claims.

This invention relates to bumping hammers particularly for thestraightening of the sheet metal portions of automobile bodies such asfenders or the like and more particularly to an attachment forsupporting a dolly in operative position with respect to the hammer.

Heretofore C frames have been used in combination with bumping hammersand dollies for n operatively positioning dollies with respect to thebumping hammer. However, with heretofore known constructions there hasbeen the disadvantage that it has been diflicult to position thecombination for straightening certain irregular body portions due to thefixed relation of the hammer and the dolly. Another difficulty has beenthat the fixed relation between the hammer handle and the dollysupporting frame has made straightening under certain conditions notmentioned difliculties and has as an object to provide a bumping hammerpivotally connected to a dolly supporting frame.

Another object of the invention is to provide a pivotal connection foradjusting not only the angular relation of the hammer with respect tothe dolly supporting frame but also the position of the hammer handlewith respect to the frame while retaining the hammer body in normalposition.

These and other objects will be apparent from the followingspecification when taken with the accompanying drawings, in which Fig. 1is an elevation of a bumping hammer according to the present inventionhaving the dolly and dolly supporting frame attached,

Fig. 2 is an exploded view of the bumping hammer and its connectionswith the dolly supporting frame,

Fig. 3 is a plan view of the dolly supporting frame attachment portion,

i Fig. 4 discloses the angular adjustment-of the hammer handle withrespect to the dolly supporting frame, and

Fig. 5 illustrates the angular adjustment of the bumping hammer withrespect to the dolly.

Referring particularly tothe drawings, reference character I indicates abumping hammer which may be of any desired design but prefer ably isthat disclosed in the copending application of Ehner J. Seiden, SerialNo. 38,398, filed August 29, 1935 (Patent No. 2,120,992, granted June21, 1938). The hammer is provided with abody 2, a head 3, a handle 4 anda controlling lever 5.

The end of the body 2 opposite the head 3 is provided, as shownparticularly in Fig. 2, with a tapped bore 6. Over the tapped bore 6 ispositioned a plug I having a base 8 with a concave recess 9 forreceiving the curved end of the hammer body 2. The plug 1 is rigidlysecured to the 1 hammer body 2 by a bolt I0 passing through the centerof the plug I and threaded in the tapped bore 6. A recess I I in theouter end of the plug I receives the head of the bolt Ill.

A frame I5, generally C-shaped in configuration supporting at one endthe dolly I6 in operative relation to the hammer head 3, is secured tothe hammer I by an attachment portion I! connected to the plug 1. Theframe I5 may take various forms for facilitating the disposal 2 of thesheet metal part to be straightened between the head 3 and the dolly I6and it is to be considered that the frame I5 illustrated in Fig. l ismerely one form which the frame may take.

The attachment portion I I includes a split collar or cylindricalportion I8 into which one end of the frame I5, preferably cylindrical inform, is disposed. The split collar I8 is clamped on the frame I5 bymeans of a thumb screw I9 passing through a lug 20 and threaded to a lug2!. In order to provide a fixed angular relation between the attachmentportion I1 and the frame I5, a pin 22 passing through and secured to theframe I5 normally seats in a recess 23 in the collar I8.

Perpendicularly disposed to the split cylindrical portion or collar I8and comprising a portion of the attachment portion I1 is a socket 24 forreceiving the plug I. Threaded into the side of the socket 24 is a thumbset screw 25 for engaging with a peripheral groove 26in the plug I forlocking the socket 24 to the plug I.

Fig. 1 discloses the normal operative relation between the hammer I andthe dolly It. In operation the sheet metal part to be straightened isdisposed between the hammer head 3 and the dolly I6. The hammer I isthen actuated by manipulating the controlling lever 5 and the hammer Iis moved over the part to be straightened. During the straighteningoperation should it be more convenient to change the angular relationbetween the handle 4 of the hammer I and the frame I5, it is merelynecessary to loosen the thumb set screw 25 and rotate the handle 4together with the body 2 about the axis of the plug 1 as shownparticularly in Fig. 4. During this motion the set screw 25 althoughloosened continues to engage with the peripheral groove 26 in the plug'1 and prevents removal of the plug 1 from the socket 24. When the adjustment of the angle between the handle 4 and the frame l5 has beenmade, the thumb screw 25 may then be tightened locking the parts intheir adjusted position.

In performing certain types of straightening operations to sheet metalparts such as on an automobile body, it is often necessary to pass overenlarged body parts such as structural frame members or perhaps badlydeformed sheet metal parts. In these cases the clearance between thehammer head 3 and the dolly I6 is insuflicient. In order to increase theclearance, the thumb screw [9 is loosened, the attachment portion I!backed away from the aligning pin 22, and the entire hammer I rotatedabout the longitudinal axis of the attachment portion [1 as shownparticularly in Fig. 5, thus providing a greatly enlarge clearancebetween the hammer l and dolly l6. When the dolly I6 has been disposedin the location desired the hammer I may then be rotated about thelongitudinal axis of the attachment portion I until the pin 22 is inalignment with the recess 23. The thumb screw [9 is then tightened andthe hammer is ready for operating. Of course, it will be understood thatthe handle 4 may be adjusted as hereinabove described to facilitatepositioning the hammer head 3 and dolly IS with respect to the work ifnecessary.

In practice the hammer head 3 and dolly 16 each may take various formsdepending on the sheet metal part to be straightened. Accordingly, theyshould be respectively removable. The frame [5 may be satisfactorilyconstructed of tubing although the invention is not limited to such aform. Furthermore, the plug 1 may be included as an integral part of thecasting comprising the body 2.

Having thus described our invention what we desire to protect and secureby Letters Patent is:

1. A device of the character described comprising a bumping hammerportion, an attachment portion, a cylindrical plug on one of saidportions, the other portion having a cylindrical socket, said plug beingdisposed rotatably in said socket, the rotative axis of said plug andthe operative axis of said hammer portion being in alignment, a dolly, aframe for supporting said dolly in operative position with respect tosaid hammer, means for detachably securing said frame to said attachmentportion, a seat on the end of said attachment portion, and means on saidframe for cooperating with said seat to provide a predetermined angularrelation between said frame and said attachment portion.

A device of the character described comprising a bumping hammer portion,an attachment portion, a plug on one of said portions, the other portionhaving a socket, said plug being disposed in said socket and rotatabletherein, means to lock said plug against axial movement from saidsocket, a dolly, a frame for supporting said dolly in operative positionwith respect to said hammer, means for detachably securing said frame tosaid attachment portion, a seat on the end of said attachment portion,and means on said frame for cooperating with said seat to provide apredetermined angular relation between said frame and said attachmentportion.

3. A device of the character described comprising a bumping hammerportion, an attachment portion, a plug on one of said portions, theother portion having a socket, said plug being disposed rotatably insaid socket, a dolly, a frame for supporting said dolly in operativeposition with respect to said hammer, a split collar form-- ing a partof said attachment portion, means to clamp said split collar on saidframe, a seat on the end of said attachment portion, and means on saidframe for cooperating with said seat to provide a predetermined angularrelation between said frame and said attachment portion.

4. A device of the character described having a bumping hammer portion,an attachment portion, a plug on one of said portions, a peripheral Lgroove on said plug, the other portion having a socket, said plug beingdisposed in said socket, means secured to said socket for engagementwith said groove to lock said attachment portion with said hammer, adolly, a frame for supporting said dolly in operative position withrespect to said hammer, and means for securing said frame to saidattachment portion.

5. A device of the character described having a bumping hammer portion,an attachment portion, a plug on one of said portions, a peripheralgroove on said plug, the other portion having a socket, said plug beingdisposed in said socket, means secured to said socket for engagementwith said groove to lock said attachment portion 5 secured to saidsocket for engagement with said groove to lock said attachment portionwith said hammer, a dolly, a frame for supporting said dolly inoperative position with respect to said hammer, a split collar forming apart of said attachment portion, the axis of said collar beingperpendicular to the axis of said socket, and means for clamping saidcollar on said frame whereby said hammer may be pivotally adjusted withrespect to said attachment portion and said hammer and attachmentportion may be pivotally adjusted with respect to said frame.

'7. A device of the character described comprising a bumping hammerportion, an attachment portion, a plug on one of said portions, theother portion having a socket, said plug being disposed in said socket,a dolly, a frame for supporting said dolly in operative position withrespect to said hammer, a split collar forming a part of said attachmentportion, means to clamp I said split collar on said frame, and means forestablishing a predetermined relative position between said frame andattachment portion.

ELMER J. SEIDEN. FRANK E. MAZUREK.

